This page mentions a promotion BMW is having where you submit your photos but then BMW is free to use the photos however they wish. It may be a good starting point to discuss the subject of copyright with your students.
The PLUS Coalition is an international non-profit initiative on a mission to simplify and facilitate the communication and management of image rights. Organized by respected associations, leading companies, standards bodies, scholars and industry experts, the PLUS Coalition exists for the benefit of all communities involved in creating, distributing, using and preserving images. Spanning more than thirty countries, these diverse stakeholders have collaborated to develop PLUS, a system of standards that makes it easier to communicate, understand and manage image rights in all countries. The PLUS Coalition exists at the crossroads between technology, commerce, the arts, preservation and education.
The Data Liberation Front is an engineering team at Google whose singular goal is to make it easier for users to move their data in and out of Google products. We do this because we believe that you should be able to export any data that you create in (or import into) a product.